1950 Fenestra Detroit Crank

A home owner says:
We have Fenestra Detroit cranks on all the windows in our home built in 1950. A few of them are now pretty loose and one unthreads when you crank the window closed.

Which replacement cranks do you have that will fit? I believe they are all the same length, but I guess I should open the windows and measure the arms to make sure.
A customer submitted photo of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Good afternoon, and thanks for posting! If at all possible, can I see the operator as fully removed from the window? I'll have to see what its arm looks like to properly identify it. I would also like to know its arm length, and the distance between its installation hole centers.
A home owner says:
Thanks Dave. Here are more photos with a tape measure for reference. The window track is crimped on the close end and I haven't been able to figure how to easily slide the arm out of the metal window frame.

The screw holes are 4.25" apart. The arm is ~9.5" from the end the end of the curve.

A customer submitted photo of a window operator.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for the dimensions! Have you seen our 39-344 & 39-358 Fenestra Casement Operators? These appear to match your dimensions fairly closely. Could you use these as a substitute? Let me know!
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